القائد علي بن يحيى الارمني (ت 249هـ / 863 م ) و دوره الحربي و الاداري

The research attempts to shed light on the leader and the prince Ali bin Yahya A1 -arminy who is considered one of the famous Abbasid leaders and princes. He did great services to the Abbasid caliphate in both administration and war .He ruled Egypt twice ,known by his good conduct and administration .He also became a leader of the thughur of Bilad al- Sham for thirteen years ,leading annual military campaigns against the Byzantine state , in which he kept al thughur of their administration , and he was characterized by his courage of his good military leadership .He ruled Armenia and Azerbaijan before he fell a martyr in al- thughur while defending them in 249 A.H. /863 A.D. The research concluded that his courage and his well-known administration represented an archetype for the brave leader of the good -natured ruler, he served Islam well and he embodied a really illuminating biography.